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EP1613002A1 - Mobiles endgerät und funkzugangspunkt in einem funkzugangssystem - Google Patents

Mobiles endgerät und funkzugangspunkt in einem funkzugangssystem Download PDF

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Publication number
EP1613002A1
EP1613002A1 EP03816597A EP03816597A EP1613002A1 EP 1613002 A1 EP1613002 A1 EP 1613002A1 EP 03816597 A EP03816597 A EP 03816597A EP 03816597 A EP03816597 A EP 03816597A EP 1613002 A1 EP1613002 A1 EP 1613002A1
Authority
EP
European Patent Office
Prior art keywords
radio access
mobile terminal
tcp
communication quality
header
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03816597A
Other languages
English (en)
French (fr)
Inventor
Masaru C/O FUJITSU LIMITED MORI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP1613002A1 publication Critical patent/EP1613002A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/19—Flow control; Congestion control at layers above the network layer
    • H04L47/193—Flow control; Congestion control at layers above the network layer at the transport layer, e.g. TCP related
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/25—Flow control; Congestion control with rate being modified by the source upon detecting a change of network conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/165—Combined use of TCP and UDP protocols; selection criteria therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0273—Traffic management, e.g. flow control or congestion control adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless

Definitions

  • the present invention relates to a mobile terminal and a radio access point in a radio access system in which the terminal is connected to the access point via a radio link.
  • Figure 1 shows the architecture of a radio access system for comparison with the OSI model.
  • the first layer (physical layer) of the OSI model, in the radio access system, provides for processing such as encoding and modulation in a radio transmission path.
  • the second layer (data link layer), in the radio access system provides for the detection of errors on the radio transmission path and mechanisms to cope with transmission delays or data losses or to ensure data bandwidth, in order to alleviate the effects of a failure that may occur in the radio transmission path.
  • the third layer (network layer) provides for processing such as routing and flow control in a network.
  • the fourth layer (transport layer) provides for end-to-end error recovery and flow control.
  • the RLP comprises two sublayers: the Link Access Control (LAC) sublayer and the Media Access Control (MAC) sublayer.
  • LAC Link Access Control
  • MAC Media Access Control
  • IP Internet Protocol
  • TCP Transmission Control Protocol
  • DiffServ which differentiates QoS (Quality of Service) levels by classifying traffic flows
  • RSVP which is a protocol for providing a bandwidth guarantee.
  • FIG 2 shows one example of how data packets are constructed.
  • TCP Transmission Control Protocol
  • IP IP protocol
  • RLP Radio Link Protocol
  • FIG. 3 shows one example of the RLP packet format.
  • sequence numbers are used not only for controlling the fragmentation of and combining into the IP packet at the upper layer, but also used for retransmission processing when an RLP packet is lost and for packet discarding when packets of the same sequence number are received.
  • IP header in the case of IPv6
  • TCP header in Figure 5
  • Figure 6 is a diagram showing one configuration example of a radio access system.
  • the radio access system shown in Figure 6 comprises a mobile terminal 10, a radio access point 12, a mobile IP router 14, and a host 16.
  • the mobile terminal 10 is connected to the radio access point 12 via a radio link, while the link between the radio access point 12 and the mobile IP router 14, as well as the link between the mobile IP router 14 and the host 14, is a wired link.
  • the mobile terminal 10 has the function of terminating the first to fourth layers.
  • the radio access point 12 has the function of terminating the first and second layers but, as the transmission medium switches from wireless to wired at the radio access point 12, to handle this, the function of a bridge 18 is provided at a layer above the second layer.
  • the mobile IP router 14 has the function of terminating the first to third layers.
  • the host 16 has the function of terminating the first to fourth layers.
  • radio retransmission control at the second layer is performed between the mobile terminal 10 and the radio access point 12.
  • IP flow control at the third layer is performed between the mobile terminal 10 and the mobile IP router 14, while TCP flow control at the fourth layer is performed between the mobile terminal 10 and the host 16.
  • burst errors often occur on a radio transmission path due to fading, etc., resulting in data packet loss.
  • the RLP performs processing for retransmission, but this processing is done without regard to any processing being performed at other layers.
  • the maximum number of data blocks that can be accepted by the data receiving side is presented to the transmitting side by using a window field in the header of a packet carrying an ACK signal that the receiving side returns to the transmitting side, thus making it possible to control the number of data blocks that the transmitting side can send without waiting for an acknowledgement; however, data transmission conditions, such as error conditions occurring over the radio link, are not reflected in determining the window size to be presented here.
  • retransmission timer value and retransmission count are determined in advance by considering the transmission conditions of the radio link; however, data delays and congestion that may occur when the TCP performs flow control are not considered here. This is also true of the flow control in the IP.
  • unnecessary retransmission occurs, for example, when the retransmission process is automatically initiated because an ACK time-out has occurred at the TCP due to an abrupt increase in transmission delay caused by retransmissions at the RLP, or when a selective retransmission request is issued because of the detection of an abnormality in the sequencing of TCP packets at the receiving side.
  • the TCP may initiates retransmission flow control, or unnecessary retransmission may occur, resulting in a decrease in the throughout of the network as a whole.
  • Patent Document 1 it is disclosed that the quality of service parameters at the physical layer of the OSI model are transferred to the upper layers as each layer provides services to the layer above, until the parameters reach the uppermost application layer, thus making the application layer fit its own performance to the quality of service presented at the physical layer.
  • An object of the present invention is to provide a technique for improving the throughout of a radio access system by exchanging communication quality parameters between different protocol layers.
  • a mobile terminal in a radio access system comprising: a communication quality detecting section for detecting communication quality at a first communication protocol layer which provides a radio link between the mobile terminal and a radio access point; and a converting section for converting the detected communication quality into information representing communication quality at a second communication protocol layer which resides above the first communication protocol layer, and for providing the information to the second communication protocol layer.
  • the second communication protocol is, for example, TCP (Transmission Control Protocol); in this case, the mobile terminal further comprises a TCP frame control section for receiving the communication quality information and using the same for TCP flow control.
  • TCP Transmission Control Protocol
  • the second communication protocol is, for example, IP (Internet Protocol); in this case, the mobile terminal further comprises a message generating section for generating an ICMP (Internet Control Message Protocol) message containing the converted communication quality information in response to an echo request message received from a remote end of an IP flow, and for transmitting the ICMP message for use in IP flow control.
  • IP Internet Protocol
  • the mobile terminal further comprises a message generating section for generating an ICMP (Internet Control Message Protocol) message containing the converted communication quality information in response to an echo request message received from a remote end of an IP flow, and for transmitting the ICMP message for use in IP flow control.
  • ICMP Internet Control Message Protocol
  • a radio access point in a radio access system comprising: a header detecting section for extracting, from a received packet, communication quality information stored in a header thereof at a first communication protocol layer which is not terminated in the radio access point; and a converting section for converting the communication quality information extracted by the header detecting section into a quality control parameter for use at a second communication protocol layer which provides a radio link between a mobile terminal and the radio access point.
  • the communication quality information stored in the header is, for example, a window size stored in a TCP header.
  • the communication quality information stored in the header is, for example, a traffic class stored in an IP header.
  • FIG. 7 is a diagram showing the flow of quality information, in the configuration diagram of Figure 6, according to a first embodiment of the present invention.
  • quality information QoS parameters
  • QoS parameters quality information to be used at the TCP layer or the IP layer is determined based on RLP packet retransmission state (number of retransmissions per unit time), RLP packet discard state (RLP packet discard rate), and retransmission processing time at the RLP layer in the mobile terminal 10 and, by using the thus determined quality information at the TCP layer or the IP layer, the communication quality at the RLP layer is reflected in the flow control at the TCP layer or the IP layer.
  • Figure 8 shows a first configuration example of the mobile terminal 10 according to the first embodiment of the present invention.
  • a TCP frame processing section 20 accepts transmit data (user data) and creates the TCP packet 22 shown in Figure 2; it also extracts received data from the TCP packet passed from an IP frame processing section 24.
  • the IP frame processing section 24 receives the TCP packet 22 from the TCP frame processing section 20 and creates the IP packet 26 shown in Figure 2; it also extracts the TCP packet 22 from the IP packet 26 passed from an RLP packet combining section 34, and passes the TCP packet 22 to the TCP frame processing section 20.
  • An RLP frame processing section 28 and an RLP packet fragmenting section 30 create the RLP packets 32 from the IP packet 26, as shown in Figure 2.
  • An RLP packet extracting section 32 extracts parameters concerned with the radio link, such as the number of retransmissions per unit time, the packet error rate, and the retransmission processing time, and passes them to a table searching/QoS parameter generating section 36.
  • the table searching/QoS parameter generating section 36 converts the number of retransmissions and the packet error rate into quality information (to be described later) for use at the IP or TCP layer, determines a timeout period longer than the above retransmission time, and passes them to the IP frame processing section 24 or the TCP frame processing section 20.
  • the IP frame processing section 24 stores the received quality information, for example, in a traffic class field 40 (see Figure 4) in the IP header of the transmit packet.
  • the TCP frame processing section 20 stores the received quality information, for example, in a window size field 42 (see Figure 5) in the TCP header of the transmit packet. Further, the received timeout period is set in a retransmission timer.
  • Figure 9 shows an example of how the window size specified in the TCP header that carries an ACK signal to be sent to the host is changed from W to W' when the frequency of occurrence of retransmission on the radio link has increased. In this way, the communication quality of the radio link can be reflected in the TCP flow control of the packets destined from the host to the mobile terminal.
  • Figure 10 shows an example of how the timeout period of the transmission timer at the TCP layer is set longer than the RLP retransmission processing time. In this way, the communication quality of the radio link can be reflected in the TCP flow control of the packets destined from the mobile terminal to the host.
  • Figure 8 has shown an example in which the QoS information is included in a packet destined from the mobile terminal to the host 16; on the other hand, Figure 11 shows an example in which the QoS information is included in a packet to be received by the mobile terminal.
  • the QoS information generated by the table searching/QoS parameter generating section 36 is passed to a message generating section 42.
  • ICMP Internet Control Message Protocol
  • the mobile terminal 10 responds to it by sending an echo reply message 48 in the form of an ICMP packet which is created by the message generating section 42.
  • the quality information at the RLP layer can be reflected in the traffic class of the IP packet to be sent from the mobile IP router 14 to the mobile terminal 10.
  • Figure 13 is a diagram showing the flow of QoS information on the configuration diagram of Figure 6 according to a second embodiment of the present invention. As shown by dashed lines in Figure 13, the header of the TCP packet transferred from the host 16 or the header of the IP packet transferred from the mobile IP router 14 is extracted at the radio access point 12, and the quality information contained in the header is reflected in the retransmission control at the RLP layer.
  • FIG 14 shows a first configuration example of the radio access point according to the second embodiment of the present invention.
  • an IP header detecting section 52 extracts the IP header from the IP packet received from the bridge 18 ( Figure 13), and a traffic class field extracting section 54 extracts the information stored in the traffic class field 40 ( Figure 4) of the IP header.
  • a table searching/QoS parameter generating section 56 determines the retransmission timer value, retransmission count, etc. at the RLP layer from the traffic class by referring to a QoS table 58 such as shown in Table 1 below, and passes them to an RLP frame processing section 60.
  • Table 1 Traffic Class Quality Assured ⁇ Low Latency Retransmission Timer Value Large ⁇ Small Retransmission Count Large ⁇ Small RLP Packet Size Small ⁇ Large Number of RLP Blocks Large ⁇ Small
  • the RLP frame processing section 60 creates RLP packets (see Figures 2 and 3) from the IP packet.
  • the above set values at the RLP layer, determined at the radio access point side, are transferred to the mobile terminal at the other end of the radio transmission path, and the same set values are set in the RLP frame processing section 12 at the mobile terminal side.
  • FIG. 15 shows a second configuration example of the radio access point according to the second embodiment of the present invention.
  • an IP header detecting section 63 extracts the TCP packet from the IP packet received from the bridge 18 ( Figure 13)
  • a TCP header detecting section 64 extracts the TCP header of the TCP packet
  • a window size field extracting section 66 extracts the information stored in the window size field 42 ( Figure 5) of the TCP header.
  • a table searching/QoS parameter generating section 56 determines the retransmission timer value, retransmission count, etc.
  • the RLP frame processing section 60 creates RLP packets (see Figures 2 and 3) from the IP packet.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
EP03816597A 2003-04-04 2003-04-04 Mobiles endgerät und funkzugangspunkt in einem funkzugangssystem Withdrawn EP1613002A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/004365 WO2004091148A1 (ja) 2003-04-04 2003-04-04 無線アクセスシステムにおける移動端末と無線アクセスポイント

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Publication Number Publication Date
EP1613002A1 true EP1613002A1 (de) 2006-01-04

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EP03816597A Withdrawn EP1613002A1 (de) 2003-04-04 2003-04-04 Mobiles endgerät und funkzugangspunkt in einem funkzugangssystem

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JP (1) JP3810421B2 (de)
CN (1) CN1689277A (de)
WO (1) WO2004091148A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8081588B2 (en) 2006-12-28 2011-12-20 Research In Motion Limited Methods and apparatus for increasing data throughput by grouping data packets into maximum transmissible units
EP2408152A1 (de) * 2010-07-16 2012-01-18 Research in Motion Limited Verfahren und Vorrichtung zur Nutzung bei der Übermittlung von Datenpaketen in einem Datenpakete-Fenster, das eine Größe hat, die basierend auf QOS-Parametern eingestellt ist
US8233438B2 (en) 2005-09-30 2012-07-31 Research In Motion Limited Methods and apparatus for dynamically adjusting a data packet window size for data packet transmission in a wireless communication network
CN103095798A (zh) * 2011-11-07 2013-05-08 宏碁股份有限公司 移动通讯装置及数据传输方法
US8477618B2 (en) 2010-07-16 2013-07-02 Research In Motion Limited Methods and apparatus for use in communicating data packets within a data packet window having a size that is set based on quality of service (QoS) parameters

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WO2007099675A1 (ja) * 2006-03-03 2007-09-07 Nec Corporation 多入力多出力通信システム、送信機及びそれらにおけるリソース割り当て方法
GB2438017A (en) 2006-05-02 2007-11-14 Skype Ltd Controlling communication quality by generating instructions providing a remedy to users to improve communication quality
KR100842281B1 (ko) * 2006-12-08 2008-06-30 한국전자통신연구원 무선 네트워크상에서 경로 회복 알림을 통하여 전송 제어 프로토콜의 성능을 관리하는 장치 및 그 방법
JP5169338B2 (ja) * 2008-03-11 2013-03-27 日本電気株式会社 無線通信システム及びその方法と、それらに用いられる装置及びプログラム
CN102752160B (zh) * 2011-04-22 2015-03-25 上海中科国嘉储能技术有限公司 一种通信通道的监测方法
CN103024815A (zh) * 2011-09-21 2013-04-03 宏碁股份有限公司 无线网络系统内传送数据的方法

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Publication number Priority date Publication date Assignee Title
JP2001094574A (ja) * 1999-09-24 2001-04-06 Nippon Telegr & Teleph Corp <Ntt> 無線ｌａｎシステム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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See references of WO2004091148A1 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8233438B2 (en) 2005-09-30 2012-07-31 Research In Motion Limited Methods and apparatus for dynamically adjusting a data packet window size for data packet transmission in a wireless communication network
US8457053B2 (en) 2005-09-30 2013-06-04 Research In Motion Limited Methods and apparatus for dynamically adjusting a data packet window size for data packet transmission in a wireless communication network
US8081588B2 (en) 2006-12-28 2011-12-20 Research In Motion Limited Methods and apparatus for increasing data throughput by grouping data packets into maximum transmissible units
US8953611B2 (en) 2006-12-28 2015-02-10 Blackberry Limited Methods and apparatus for increasing data throughput by grouping data packets into maximum transmissible units
EP2408152A1 (de) * 2010-07-16 2012-01-18 Research in Motion Limited Verfahren und Vorrichtung zur Nutzung bei der Übermittlung von Datenpaketen in einem Datenpakete-Fenster, das eine Größe hat, die basierend auf QOS-Parametern eingestellt ist
US8477618B2 (en) 2010-07-16 2013-07-02 Research In Motion Limited Methods and apparatus for use in communicating data packets within a data packet window having a size that is set based on quality of service (QoS) parameters
CN103095798A (zh) * 2011-11-07 2013-05-08 宏碁股份有限公司 移动通讯装置及数据传输方法
US9112906B2 (en) 2011-11-07 2015-08-18 Acer Incorporated Data transmission methods and appratuses using the same
CN103095798B (zh) * 2011-11-07 2015-10-28 宏碁股份有限公司 移动通讯装置及数据传输方法

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JPWO2004091148A1 (ja) 2006-07-06
CN1689277A (zh) 2005-10-26
JP3810421B2 (ja) 2006-08-16
WO2004091148A1 (ja) 2004-10-21

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